Or, and this may seem controversial to many but it’s worth considering, it could be that the human brain develops in accordance to what it experiences, and things it experiences and is made to do more often are reflected in the sorts of connections that develop. This would suggest that there aren’t actually any marked differences between male and female brains. However, this would mean that there is no scientific basis for all of our stereotypes and prejudices about what certain sexes should/shouldn’t do and they all stem from irrational or unpleasant cultural influences that haven’t gone away yet, forcing us to admit to ourselves that our preconceived notions about certain sexes or genders are just self-fulfilling clichés with no logical basis, potentially threatening our beliefs, our positions and even our identity.
SEX. The physical difference between male and female in animals.
2. In the human species the male is called man, (.) and the female, woman. (.) Some human beings whose sexual organs are somewhat imperfect, have acquired the name of hermaphrodite. (.)
3. In the civil state the sex creates a difference among individuals. Women cannot generally be elected or appointed to offices or service in public capacities. In this our law agrees with that of other nations. The civil law excluded women from all offices civil or public: Faemintae ab omnibus officiis civilibus vel publicis remotae sunt. Dig. 50, 17, 2. The principal reason of this exclusion is to encourage that modesty which is natural to the female sex, and which renders them unqualified to mix and contend with men; the pretended weakness of the sex is not probably the true reason. Poth. Des Personnes, tit. 5; Wood's Inst. 12; Civ. Code of Louis. art. 24; 1 Beck's Med. Juris. 94. Vide Gender; Male; Man; Women; Worthiest of blood.
Humans and other mammals have an XY sex-determination system : the Y chromosome carries factors responsible for triggering male development. The "default sex," in the absence of a Y chromosome, is female-like. Thus, XX mammals are female and XY are male. In humans, biological sex is determined by five factors present at birth: the presence or absence of a Y chromosome (which alone determines the individual's genetic sex ), the type of gonads , the sex hormones , the internal reproductive anatomy (such as the uterus in females), and the external genitalia.